@misc{indiciaecc66bb438dda,
  title = {Goose counts from aerial photographs using an optical digitizer},
  author = {D.S. Gilmer and J.A. Brass and L.L. Strong and D.H. Card},
  year = {1988},
  url = {https://pubs.usgs.gov/publication/1001659},
  note = {Source identifier: 1001659}
}